Questions tagged [negative-voltage]

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Why is my signal stronger in the positive than in the negative when i use 2n3819?

simulate this circuit – Schematic created using CircuitLab In the above circuit I have created a JFET amplifier for small signal purposes. When I run tests on the circuit, i get this weird ...
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224 views

Transistor logic to drive h-bridge with negative voltage source

Shown below is a H-Bridge circuit I have used to drive the cathode of a VFD display with a source voltage of +2.4V with a +3.3V digital logic level. I have decided to switch the cathode source ...
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65 views

Negative Voltage In Capacitor When + Side Is Connected To -

Hello, i just didn't understand that why we get negative voltage(-4.7V) from capacitor's negative pole when we apply 0V to capacitor's positive pole.As i figured out, this is used in transistor flip ...
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adjustable voltage controlled current source with negative values

I have a MEMS mirror which can tilt based on the input current. The current can vary between -15mA to +15mA in order to change the angle of the mirror from -15 to +15 degree. Now, I need to have an ...
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204 views

Regulating Negative Voltage

Can the TL783 be used to regulate negative voltage by connecting the output to my system ground and using the regulator ground as my negative voltage source? I couldn't find anything in the datasheet ...
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Applying +U & -U to BJT Load Line

So, I was wondering, how to draw or specify Vcc to the output characteristic (Ic versus Uce - common emitter), when we apply positive voltage (+12V lets say) to the collector and negative voltage (-...
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465 views

Simplest way of getting +/-12V from a 0-12V power supply

This question is probably easy, but as a total electrican noob I couldn't really find a suitable answer so far. Some circuits, like amplifiers, require a -12V and a +12V rail respect to the ground. ...